Roll press machine

Abstract

A roll press machine according to the present disclosure includes a hot press mechanism having a pair of rollers arranged with a gap therebetween and heating mechanisms that heat the pair of rollers to heat and roll a forming material, a material feeding mechanism that feeds the forming material and a conveying mechanism that conveys the forming material fed by the material feeding mechanism to the hot press mechanism, in which each of the pair of rollers in the hot press mechanism has a roller structure including an outermost layer and an intermediate layer inside the outermost layer, and a thermal expansion coefficient of the outermost layer is lower than a thermal expansion coefficient of the intermediate layer.

What is claimed is: 
     
         1 . A roll press machine comprising:
 a hot press mechanism having a pair of rollers arranged with a gap therebetween and heating mechanisms that heat the pair of rollers to heat and roll a forming material;   a material feeding mechanism that feeds the forming material; and   a conveying mechanism that conveys the forming material fed by the material feeding mechanism to the hot press mechanism,   wherein each of the pair of rollers in the hot press mechanism has a roller structure including an outermost layer and an intermediate layer inside the outermost layer, and   a thermal expansion coefficient of the outermost layer is lower than a thermal expansion coefficient of the intermediate layer.   
     
     
         2 . The roll press machine according to  claim 1 ,
 wherein the maximum heating temperature on surfaces of the respective pair of rollers by the heating mechanisms is 300° C. or more to 650° C. or less.   
     
     
         3 . The roll press machine according to  claim 1 ,
 wherein internal stresses in the respective outermost layers of the pair of rollers are higher at a position where pressurization treatment is completed than at a position where the forming material is not fed yet.   
     
     
         4 . The roll press machine according to  claim 1 ,
 wherein a hardness at a central part of an upper roller in the pair of rollers is lower than a hardness at a central part of a lower roller.   
     
     
         5 . The roll press machine according to  claim 1 ,
 wherein a temperature at the central part of the upper roller in the pair of rollers is higher than a temperature at the central part of the lower roller.   
     
     
         6 . The roll press machine according to  claim 1 ,
 wherein the hardnesses at the respective central parts of the pair of rollers are lower than hardnesses at end parts of the pair of rollers.   
     
     
         7 . The roll press machine according to  claim 1 ,
 wherein the temperatures at the respective central parts of the pair of rollers are higher than temperatures at end parts of the pair of rollers.   
     
     
         8 . The roll press machine according to  claim 1 ,
 wherein materials of the pair of rollers are the same.   
     
     
         9 . The roll press machine according to  claim 1 ,
 wherein the outermost layers are formed by being coated on the respective pair of rollers.